{% extends '!layout.html' %}
{% block document %}
{{super()}}
    <a href="https://www.sphinxsys.org">
        <img style="position: absolute; top: 0; right: 0; border: 0;" src="https://www.sphinxsys.org/images/ribbon.png" alt="Back to SPHinXsys project.">
    </a>
{% endblock %}